通过室内对不同密度棉蚜两次为害棉株的生态学参数测定，结果表明：棉株在受到棉蚜二次为害后，无论是棉株生长点或是不同生长期棉株受害，均可影响棉蚜种群数量下降，增长率降低，发育历期增大，扩散率提高，体色趋变黄色。可以证明受害棉株明显存有诱导抗性，且６片真叶以后的诱导抗性大于６片真叶以前。 The indoor ecological parameters of cotton plants infected with cotton aphid at different densities were determined. The results showed that cotton plants affected either cotton plant growth point or cotton plant at different growth stages after secondary damage by cotton aphid Cotton aphid population decreased, the growth rate decreased, the developmental period increased, the proliferation rate increased, the body color changed yellow. It can be proved that the infected cotton plants showed obvious induced resistance, and the induced resistance of 6 true leaves was greater than 6 true leaves before.